Characteristics and mechanism of nano‐polycrystalline La₂O₃ thin‐film resistance switching memory

Abstract

We investigated the characteristics and the mechanism of Pt/La2O3/Pt resistance switching memory with a set of measurements. The La2O3 films were determined as nano‐poly‐crystalline (diameter of the nanocrystals 5–10 nm) by XRD and HRTEM analysis. The Pt/La2O3/Pt device exhibited excellent resistive switching properties, including low switching voltage (<2 V), large low/high resistance ratio (>108), and good cycling endurance property. The conduction mecha‐ nisms of the Pt/La2O3/Pt device were revealed with current–voltage characteristics, which are different in the low and high resistance states. Furthermore, XPS analysis and temperature‐dependent resistance measurement in the low resistance state showed that the conducting filaments in the Pt/La2O3/Pt device are mainly affected by oxygen defects rather than metallic La. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Perovskite LaNiO3 Nanocrystals inside Mesostructured Cellular Foam Silica: High Catalytic Activity and Stability for CO2 Methanation

“…In addition, Figure 6h,i shows the HRTEM images of the reduced 30LNOM-C-650. The lattice spacing of about 0.326 nm belongs to the (222) crystal plane of La 2 O 3 , [41] and lattice spacing of about 0.202 nm belongs to the (111) crystal plane of metallic Ni, which is closely related to the active site of CO 2 methanation reaction. [42] 2.2.…”

Отрицательная Дифференциальная Проводимость Структур На Основе Оксида Лантана

“…В этой связи подробно исследованы структурные, оптические и электрические характеристики h-La 2 O 3 [1][2][3][4][5][6]. Кроме того, в структурах на основе La 2 O 3 (TiN/La 2 O 3 /PtTi/SiO 2 /Si, Pt/La 2 O 3 /Pt) выявлена резистивная память с биполярным переключением, разрабатываемая для создания энергонезависимой резистивной памяти (RRAM) [7,8].…”

Study of oxygen diffusion in dense lanthanum oxide ceramics

“…Then, the diameter and the thickness were measured to obtain the volume, and the density was determined from the weight of disk. The disk density reached 6.4 g/cm 3 . The sintered disks were polished and finished with several grades of diamond paste.…”

“…1)3) Oxygen defects in the lattice of La 2 O 3 thin films pose problems for their practical application. 3) At present, research on the direct diffusion of oxygen in La 2 O 3 is technically impossible because La 2 O 3 is unstable in air. La 2 O 3 reacts with atmospheric water vapor and easily transforms to lanthanum hydroxide [La(OH) 3 ].…”